j@wd42:~/www/extensions/SemanticMediaWiki$ php maintenance/SMW_refreshData.php 
Refreshing all semantic data in the database!
---
 Some versions of PHP suffer from memory leaks in long-running scripts.
 If your machine gets very slow after many pages (typically more than
 1000) were refreshed, please abort with CTRL-C and resume this script
 at the last processed page id using the parameter -s (use -v to display
 page ids during refresh). Continue this until all pages were refreshed.
---
Processing all IDs from 1 to last ID ...

Notice: Array to string conversion in /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Writers.php on line 384

Call Stack:
    0.0003     260392   1. {main}() /home/j/www/phase3/extensions/SemanticMediaWiki/maintenance/SMW_refreshData.php:0
    2.1222   27606552   2. SMWSQLStore3->refreshData() /home/j/www/phase3/extensions/SemanticMediaWiki/maintenance/SMW_refreshData.php:147
    2.1222   27606552   3. SMWSQLStore3SetupHandlers->refreshData() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3.php:404
    2.1234   27613456   4. SMWUpdateJob->run() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_SetupHandlers.php:442
    2.1260   27619648   5. SMWParseData::storeData() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/jobs/SMW_UpdateJob.php:64
    2.1265   27622024   6. SMWStore->updateData() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/SMW_ParseData.php:374
    2.1335   27623232   7. SMWSQLStore3->doDataUpdate() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SMW_Store.php:234
    2.1335   27623232   8. SMWSQLStore3Writers->doDataUpdate() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3.php:333
    2.1336   27623280   9. SMWSQLStore3Writers->doFlatDataUpdate() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Writers.php:85
    2.1340   27624112  10. SMWSQLStore3Writers->preparePropertyTableUpdates() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Writers.php:155
    2.1367   27630600  11. array_diff_assoc() /home/j/www/phase3/extensions/SemanticMediaWiki/includes/storage/SQLStore/SMW_SQLStore3_Writers.php:384